/*
 * Copyright 2002-2013 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.springframework.security.web.session;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.security.access.AccessDeniedException;
import org.springframework.security.web.access.AccessDeniedHandler;
import org.springframework.util.Assert;

/**
 * An adapter of {@link InvalidSessionStrategy} to {@link AccessDeniedHandler}
 *
 * @author Rob Winch
 * @since 3.2
 */
public final class InvalidSessionAccessDeniedHandler implements AccessDeniedHandler {
    private final InvalidSessionStrategy invalidSessionStrategy;

    /**
     * Creates a new instance
     * @param invalidSessionStrategy the {@link InvalidSessionStrategy} to delegate to
     */
    public InvalidSessionAccessDeniedHandler(
            InvalidSessionStrategy invalidSessionStrategy) {
        Assert.notNull(invalidSessionStrategy, "invalidSessionStrategy cannot be null");
        this.invalidSessionStrategy = invalidSessionStrategy;
    }

    public void handle(HttpServletRequest request,
            HttpServletResponse response,
            AccessDeniedException accessDeniedException) throws IOException,
            ServletException {
        invalidSessionStrategy.onInvalidSessionDetected(request, response);
    }
}